Blonde hair is a beautiful color, but it can be challenging to maintain. Blonde hair can become dull and brassy due to oxidation from the sun, chlorine, and other environmental factors. To keep blonde hair looking vibrant, many people turn to purple shampoo. Purple shampoo is specially formulated to help restore the brightness of blonde hair by neutralizing yellow and orange tones. Check out these purple shampoos for blonde hair and see which one works best for you.